Number of Asm failuregroup disks needed

Question

hi guys,
guys can ane one tell me...for normal and high redundancy how many failure groups have to configured and how many disks can stay in each failure group please

Answer 1

A diskgroup is divided into failure groups and each disk is inexactly one failure group. A failure group is a collection of disks that can become unavailable due to failure of one of its associated components.
Redundancy for diskgroups can be either normal where files are two way mirrored (requiring alleast two failure groups) or high redundancy which provides a higher degree of protection using three way mirroring (requring atleast three failure groups).
After you create a diskgroup, you cannot change its redundancy level. If you want a different redundancy, then you must create another diskgroup with the desired rendundancy, then move the datafiles using RMAN restore from the original diskgroup to the newly created diskgroup.